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BENEFIT PLANS: (Details 5) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Accumulated comprehensive loss, May 1, 2013 $ 14,953 $ 18,806
Net actuarial gain 4,998 (2,191)
Amortization of net loss (1,257) (1,662)
Accumulated comprehensive loss, April 30, 2015 (10,833) (9,175)
Accumulated comprehensive loss, May 1, 2013 (9,175) 11,564
Net actuarial gain 3,099 (1,359)
Recognition of settlement loss (1,067)  
Recognition of settlement loss (662)  
Amortization of net loss (779) (1,030)
Accumulated comprehensive loss, April 30, 2015 $ 17,627 $ 14,953